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Lecture 7 Shallow clastic seas

Lecture 7 Shallow clastic seas. epicontinental. pericontinental. Dominant controls on sedimentation patterns. Sediment transport (hydraulic regime) Sediment supply Relative sea-level changes Tectonic environment. Dominant controls on sedimentation patterns.

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Lecture 7 Shallow clastic seas

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  1. Lecture 7Shallow clastic seas

  2. epicontinental pericontinental

  3. Dominant controls on sedimentation patterns • Sediment transport (hydraulic regime) • Sediment supply • Relative sea-level changes • Tectonic environment

  4. Dominant controls on sedimentation patterns • Sediment transport (hydraulic regime) • Sediment supply • Relative sea-level changes • Tectonic environment

  5. EXAMPLES Tectonic environment U.S. Eastern seaboard Gulf of Alaska Taiwan

  6. Dominant controls on sedimentation patterns • Sediment transport (hydraulic regime) • Sediment supply • Relative sea-level changes • Tectonic environment

  7. Dynamic stratigraphic models Rate of sediment supply exceeds rate of accommodation-space creation and sediment dispersal Regression dominates

  8. Rate of sea-level rise and sediment transport/dispersal exceeds rate of sediment supply Transgression dominates

  9. Dominant controls on sedimentation patterns • Sediment transport (hydraulic regime) • Sediment supply • Relative sea-level changes • Tectonic environment

  10. 80% 3% 17%

  11. Tide-dominated shallow seas Supply-dominated examples are rare: Amazon shelf Bohai gulf Tidal range > 3-4 meters V > 60 cm/sec Accommodation-dominated situations are much more common Partially enclosed seas, elongate seaways, blind gulfs

  12. 150 100

  13. Storm-dominated systems

  14. Transport, deposition and erosion in the near-shore environment

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